kirby



(No Model.) 2 Sheets-Sheet 2. J. J. KIRBY.

SAW MILL SET WORKS.

Patented Mar. 29, 1887.

1721/ (an-Z02",

UNITED STATES PATENT Erica.

JAMES J. KIRBY, OF MOLINE, ILLINOIS, ASSIGNOB TO WILLIAMS, \VHITE &

(30., OF SAME PLACE. 7

SAW-MILL SET-WORKS.

SPECIFICATION forming part of Letters Patent No. 360,305, dated March. 29, 1887.

Application filed August 16, 1886.

To all whom it may concern.-

Be it known that I, J AMES J. KIRBY, of the city of Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Saw-Mill Carriages, of which the following is a specification.

This invention relates to saw-mill carriages, and has reference more particularly to the devices for receding the head-blocks and their knees, in lieu of offsetting the carriage when gigging back.

To this end the invention consists in making each head-block of two parts, one of which is rigidly bolted to the frame-work of the carriage, while the other part, which carries the knee, is movable toward and away from the saw.

The invention further consists in combining with the head-block and knee, constructed as above set forth, a hand-lever for advancing or receding the movable sections of the headblocks.

In the drawings, Figure 1 is a cross-section 2 of a saw-mill carriage, showing my improvements applied thereto; Fig. 2, a rear end View of the headrblock and knee; Fig. 3, an e11- larged detail View, and Figs. 4: and 5 views illustrating certain modifications.

In sawmills, and particularly band saw mills, when gigging back past the saw after a cut has been made, the saw is liable to touch the face of the log and mar the same. To obviate this difficulty, it is customary either to 3 5 offset the entire carriage or to deflect the saw,

in case of band-saw mills. These plans are objectionable, the first because of the power required and the difficulty of maintaining good working adjustments, and the second because of the effect upon the saw. I therefore move simply the head-blocks with their knees, as will now be explained.

A A indicate the longitudinal timbers or sills of a saw-mill carriage, and B indicates 5 one of the head-blocks carried thereby, from two to five being commonly used on one carriage. The head-block resembles in its general construction and appearance those now in common use, and is or may be made open on Serial No. 211,024. (No model.)

its upper face and grooved to receive the slid 5o ing knee 0, as shown in both figures. In order to move the knee upon the head-block, it

is formed with a rack which meshes with a pinion mounted rigidly upon the set-shaft D,

as is usual. U

E indicates what may be termed the base or lower section of the head-block,which is bolted rigidly at each end to the timbers A of the carriage, and it is upon the upper face of this base or lower section that the body or upper section, B, of the head-block with its knee slides. The upper face of the base or lower section, E, is grooved, as clearly shown in Fig.

2, to form a seat for the body or upper section, B, and prevent side play or lateral movement thereof.

Near the forward end the body B is pro vided with'a depending guiding-bolt, F, which projects down through a slot in the base or lower section, E, and is furnished at its lower end with a nut, G, as shown in Fig. 1.

At or near the rear end the base or lower section, E, is provided with a screw-bolt, H, which passes vertically through a slot in the body or upper section, B, as shown in Fig. 1. 7

By means of the bolts F and H the body or upper section is guided in its movements and held firmly to its seat upon or in the base or lower portion. It will also be observed that by means of the bolts F and II adjustment may be made to compensate for wear.

Journaled in the base or lower portion, E, near its rear end, is a shaft, I, which extends parallel with the shaft D,which latter is journaled in and moves with the bodies or upper sections, B, as shown in Figs. 1 and 2, the shaft I being provided with a hand-lever, J, and with an eccentric, K.

L indicates a link or block connecting the shafts Dand I. This block freely encircles the set-shaft D, so as to allow the latter to turn, and the plate at its bottom end encircles the eccentric K, rigidly secured to' shaft I, as shown in Figs. 1, 2, and 3.

Now it will be seen that as the shaft I is ro- 5 tated in its bearings by means of the handlever J the eccentric K is also rotated, and the latter, acting through the link or block L,

moves the set-shaft horizontally a short distance.

As the set-shaft is journaled in the body or upper section of head-block B, any lateral or horizontal movement of the set'shaft causes a similar and equal movement of said body or upper section of the head-block upon the base or lower section, as indicated by the dotted lines in Fig. 1. In thus moving back the relative positions of the knee and the body of the head-block are not in the least affected. As the set-shaft D extends from one head-block to the other, of course when one of them is receded the others will be receded correspondingly.

The shaft I may extend parallel with the set-shaft throughout the entire length of the latter, and it may be provided with an eccentric and a connecting link or plate at each head-block, and though this is not essential it 1s advisable. It will be seen that the shaft I may be provided with one or more handles at different parts of its length, so as to operate it from either end of the carriage.

' The present invention is not restricted to the particular devices for moving the main head-block upon the base or lower section, as it is apparent that other and equivalent means will suggest themselves to the skilled mechanic.

In Figs. 4 and 5 are shown modifications of the device which will accomplish the same result as is attained by the construction shown in Figs. 1, 2, and 3. In Fig. 4, in lieu of the eccentric, an arm, secured rigidly to the shaft I, is employed, the arm being pivotally connected to the main head-block or the set-shaft by alink. In Fig. 5 asinglelever is employed, the lever being slotted and engaging witha stud or pin upon the main head-block. A screw might also be employed to move one part of the head-block upon the other; but any of the arrangements shown are preferred, as the action is much' more rapid than that secured by a screw.

When the hand-lever is thrown forward, the centers of the set-shaft, the eccentric, and the journal of the hand-lever are all in a straight line, and the head-block thereby locked in position.

It will be apparent that the hand-lever may be pivoted directly to the carriage instead of to the base or lower section of the head-block, and it will likewise be observed that the entire head-block may be made to slide back and forth, in which case only suitable bearingblocks would be needed where the head-blocks rest upon the carriage, the operating-shaft in such case being journaled in the carriageframing,

In some cases it may be found desirable to move the main head-block B upon its base E by means of a steam or air actuated piston.

I am aware that it has been proposed to construct a saw-mill carriage in two parts, the upper part provided with head-blocks and swiveled upon the lower part, so that either end of the upper part might be thrown toward or away from the saw for taper sawing, and this I do not claim.

My object is to move the log bodily, and at both ends equally toward and from the saw-a result not attainable by nor contem plated in the construction above set forth.

Having thus described my invention, what I claim is- 1. In combination with a saw-mill carriage, a head block or support (one or more) upon which the log may rest adjustable in the direction of its length transversely across the carriage wholly independent of any movement of the latter.

2. In combination with a saw-mill carriage, a head-block made in two parts, one part being rigidly affixed to the carriage and the other part longitudinally movable across the carriage'upon the fixed part.

3. In combination with a saw-mill carriage, a two-part head-block mounted thereupon anda hand-lever adapted and arranged to move the body or upper portion of the head-.

block toward and from the saw.

' 4. In combination with a saw-mill carriage, a series of head-blocks, each consisting of a base or lower section rigidly affixed to the carriage and an upper section or body mounted and adapted to slide upon the base or lower section, a series of knees mounted upon the main' head-blocks, a set-shaft for movlngall the knees and j ournalcd in the sliding bodies, a hand-lever pivoted to a fixed part of the carriage, and a connection, substantially such as shown, between the hand-lever and the setshaft.

5. In combination with a saw-mill carnage, a head-block consisting of a fixed base or lower section and a sliding body or upper section mounted upon the fixed base, the two parts being respectively grooved and tongued, as and for the purpose set forth.

6. In combination with a saw-mill carnage, a headblock consisting of a fixed base or lower section, a sliding upper section mounted on said base, and screw-bolts F and H, each secured to one section and projecting through a slot in the other.

7. In combination with a saw-mill carriage, a series of head-blocks, each consisting of a base or lower section rigidly secured thereto, a series of bodies or upper sections mounted upon the first and provided with knees, a setshaft for moving the knees journaled in the .and a link or plate encircling the eccentric and the set-shaft.

8. In combination with a saw-mill carriage, a head-block mounted thereupon and consisting of two parts, one secured rigidly to the carriage and the other adapted to slide upon the stationary part, and a lever pivoted to the lengthwise upon the fixed section without de- 15 stroying the relative adj ustment of the knee and head-block.

10. In combination with a saw-mill car lage, a series of two-part head-blocks consisting of fixed and sliding parts, knees mounted there- 20 on, and knee-actuating mechanism, substantially as described, mounted in the sliding part of the head-blocks.

JAMES J. KIRBY.

Witnesses:

SAML. S. DAVIS, J. B. OAKLEAF. 

